灌水频率对紫花苜蓿耗水规律及产量的影响

为探究紫花苜蓿适宜的灌水频率,在温室模拟条件下进行试验,设定W_2(2天)、W_4(4天)、W_6(6天)、W_(10)(10天)和W_(15)(15天)5个灌水频率,试验结果表明:较高的灌水频率(W_4)利于0~40 cm土层有适宜的含水量,较低的灌水频率(W_6、W_(10)、W_(15))有利于40~100 cm土层含水量的提高;随着灌水频率的增加,苜蓿产量和水分利用效率先增加后降低,最高值均出现在W_4处理,显著高于W_2、W_(10)、W_(15)(P0.05);耗水量随灌水频率的增加,呈先降低后增加的趋势,W15处理耗水量最高,显著高于W_4、W_6、W_(10)(P0.05)。因此,W_4处理可以获得较高的苜蓿产量和适宜的土壤含水量,即4天1次的灌水频率为最佳处理。

Effects of Irrigation Frequency on Water Consumption Pattern and Yield of Medicago sativa

To explore the effects of different irrigation frequencies on Medicago sativa water consumption pattern, yield and water use efficiency, a greenhouse experiment was carried out to study the change of Medicago sativa under five different irrigation frequencies, including 2, 4, 6, 10, 15 days. The results showed that the yield and water use efficiency ofMedicago sativa increased first and then decreased with the increase of irrigation frequency, and the highest value appeared in the 4 days treatment, which was significantly higher than that of 2, 10 and 15 days (P <0.05). Meanwhile, with the increase of irrigation frequency, water consumption dropped at first and rose later. The 15 days treatment had the highest water consumption, significantly higher than 4, 6 and 10 days (P <0.05). On the whole, the 4 days treatment was the optimal treatment according to preliminary inference.